Comprehensive Video Switch CVG 606xl User Manual

CVG-606xl  
6x6 Video/Audio Matrix Switcher  
CVG-808xl  
8x8 Video/Audio Matrix Switcher  
USER MANUAL  
 
12 TROUBLESHOOTING  
12.1 Power and Indicators  
14  
14  
12.2 Video Signal  
12.3 Audio Signal  
12.4 Control  
14  
15  
15  
16  
12.5 Switching Malfunctions  
13 COMMUNICATION PROTOCOL  
16  
FIGURES  
FIGURE 1: CVG-606XL FRONT/REAR PANEL FEATURES  
FIGURE 2: DIP SWITCHES GENERAL VIEW  
FIGURE 3: RS-232 CONTROL CONNECTOR WIRING  
FIGURE 4: RS-232 AND RS-485 OPERATION  
FIGURE 5: TERMINATING THE LINE  
6
10  
11  
11  
11  
12  
FIGURE 6: BASIC VIDEO-AUDIO SETUP  
TABLES  
TABLE 1: CVG-606XL FRONT PANEL FEATURES  
TABLE 2: CVG-606XL REAR PANEL FEATURES  
6
7
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1
INTRODUCTION  
Congratulations on purchasing your Matrix Switcher. This user manual describes the following products:  
CVG-606xl  
CVG-808xl  
1.1 A Word on Video/Audio Switchers  
A video/audio switcher usually switches between several sources (inputs) and one or more acceptors (outputs).  
A switcher that allows several inputs to be connected to several outputs simultaneously is called a Matrix  
Switcher. Switchers may be of the electronic or mechanical type. Most matrices are of the active electronic type,  
with many crosspoints. Vertical Interval Switching, frequently used in video, ensures that the transition from  
one video source to another (such as switching between two genlocked cameras) is smooth and without  
interference. The switching and changeover is done during the blanked vertical interval period, when the  
transition is hidden from the eyes. Vertical Interval Switching is needed when recording or transmitting a video  
program involving several video sources, as in live broadcast, to ensure clean, undisturbed picture transitions.  
The switched sources should be genlocked. Matrices and switchers may sometimes be RS-232 or RS-485/422  
controlled. Each of these options is a way of remotely controlling a video/audio device (switcher etc.) using a  
PC with a serial port, or another device that uses a similar communication protocol. The simplest connection  
between the RS-232 controller and the controlled device uses two wires (TRANSMIT, RECEIVE) and a  
common ground wire. Finally, the wide video bandwidth permits the Matrix Switchers to be used in the most  
demanding applications.  
1.2 Factors Affecting Quality of Results  
There are many factors affecting the quality of results when signals are transmitted from a source to an acceptor:  
Connection cables - Low quality cables are susceptible to interference, they degrade signal quality due  
to poor matching and cause elevated noise levels. They should therefore be of the best quality.  
Sockets and connectors of the sources and acceptors - So often ignored, they should be of highest  
quality, since "Zero Ohm" connection resistance is the target. Sockets and connectors also must match  
the required impedance (75ohm in video). Cheap, low quality connectors tend to rust, thus causing  
breaks in the signal path.  
Amplifying circuitry - Must have quality performance when the desired end result is high linearity, low  
distortion and low noise operation.  
Distance between sources and acceptors - Plays a major role in the final result. For long distances  
(over 15 meters) between sources and acceptors, special measures should be taken in order to avoid cable  
losses. These include using higher quality cables or adding line amplifiers.  
Interference from neighboring electrical appliances - These can have an adverse effect on signal  
quality. Balanced audio lines are less prone to interference, but unbalanced audio should be installed far  
from any mains power cables, electric motors, transmitters, etc. even when the cables are shielded.  
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2
SPECIFICATIONS  
CVG-606XL  
CVG-808XL  
6x6  
8x8  
8 composite video,  
1 sync/video genlock with 1 sync/video genlock with  
Configuration  
6 composite video,  
Input Type  
sync select switch,  
6 stereo audio  
sync select switch,  
8 stereo audio  
Video: BNC connectors  
Audio: RCA connectors  
Composite video:  
1Vpp/75ohm,  
Video: BNC connectors  
Audio: RCA connectors  
Composite video:  
1Vpp/75ohm,  
Input  
Connections  
Input Level  
Sync/video genlock:  
1Vpp/75ohm  
Sync/video genlock:  
1Vpp/75ohm  
Audio: +4dBm/62kohm  
6 composite video  
6 audio stereo  
Audio: +4dBm/33kohm  
8 composite video  
8 audio stereo  
Output Type  
Video: BNC connectors, Video: BNC connectors,  
Output  
Audio: RCA connectors  
Composite video:  
1Vpp/75ohm  
Audio: RCA connectors  
Composite video:  
1Vpp/75ohm  
Connector  
Output Level  
Audio: +4dBm/50ohm  
(27Vpp max.)  
Audio: +4dBm/50ohm  
(24Vpp max.)  
74dB  
74dB  
Video S/N  
Ratio  
88dB unweighted, (1Vpp) 88dB unweighted, (1Vpp)  
Audio S/N  
Ratio  
Exceeding 200MHz  
Exceeding 100kHz  
0.05%  
Exceeding 200MHz  
Exceeding 100kHz  
0.05%  
Video  
Bandwidth  
Audio  
Bandwidth  
Differential  
Gain  
0.03Deg.  
0.03Deg.  
Differential  
Phase  
<0.05%  
<0.1%  
<-50dB @ 5MHz  
<0.05%  
<0.1%  
<-50dB @ 5MHz  
K-Factor  
Non Linearity  
Video  
Crosstalk  
0.016% (1V, 1KHz)  
0.004%  
Vertical interval  
Manual, RS-232 or  
RS-485  
0.016% (1V, 1KHz)  
0.004%  
Vertical interval  
THD  
2nd Harmonic  
Switch System  
Control Type  
Manual, RS-232 or RS-485  
11VA  
11VA  
Power  
Consumption  
3.4 kg (7.5lbs.) Approx.  
19" x 7" x 2U  
3.5 kg (7.8lbs.) Approx.  
19" x 7" x 2U  
Weight  
Dimensions  
(H x W x D)  
Power Source  
230VAC, 50/60 Hz,  
(115VAC, U.S.A.)  
230VAC, 50/60 Hz,  
(115VAC, U.S.A.)  
3
HOW DO I GET STARTED?  
The fastest way to get started is to take your time and do everything right the first time. Taking 15 minutes to  
read the manual may save you a few hours later. You don’t even have to read the whole manual - if a certain  
section doesn’t apply to you, you don’t have to spend your time reading it.  
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4
UNPACKING AND CONTENTS  
The items contained in your CVG accessory package are listed below. Please save the original box and  
packaging materials for possible future transportation and shipment of the machine.  
Matrix Switcher  
CD with Control software  
AC Power Cable  
User Manual  
Null Modem Adapter Connector  
4 Rubber Feet  
4.1 Optional Accessories  
The following accessories, which are available from CVG, can enhance implementation of your machine. For  
information regarding cables and additional accessories, contact your CVG dealer.  
BNC "Y" Connector - Used for looping purposes and splits the incoming signal to enable connection of  
an additional machine.  
CVG-KR10D - (Composite-YC Comb Filter/Transcoder) can be serially connected to a Matrix Switcher  
for video format conversion (between two popular video formats - composite video and YC (Super-Video).  
The decoding from composite to Y/C is done digitally using an adaptive comb filter and DSP techniques to  
minimize dot-crawl and cross-color. A built-in vertical enhancer circuit reduces noise and dot-crawl on the Y  
signal. In addition, the CVG-KR10D provides an independent Y/C to Composite route, for simultaneous bi-  
directional operation. The CVG-KR10D is very small in size, and is fed from an external 12VDC supply,  
thus ideal for fieldwork.  
5
GETTING TO KNOW YOUR MATRIX SWITCHER  
Most front/rear panel features of the Matrix Switchers described in this manual are very similar. Therefore, only  
the CVG-606xl is described and it represents the rest of the Matrix Switchers.  
5.1 Your CVG-606xl Matrix Switcher  
The CVG-606xl is a broadcast quality, 6x6 Vertical Interval - Audio Stereo Matrix Switcher for composite  
video and stereo audio signals. They are true matrices, allowing the user to route any input to any or all outputs  
simultaneously. Since they switch during the vertical interval, transitions are glitch-free when sources share  
common reference sync. They can switch stereo audio signals in "audio-follow-video" mode or separately  
(breakaway). Also, the TAKE button allows the user to place multiple switches in a queue, and then activate  
them with one touch of this button or a single serial command. They have manual, RS-232 and RS-485  
controls. Six preset memory locations are provided for quick access to common configurations, and the non-  
volatile memory "remembers" the last setting prior to being powered-down. The machines have an external  
Sync/Genlock input as well, and may be programmed to switch according to the timing of either this input or of  
source number 1. Windows 95/NT (TM) control software is provided free with the machine.  
The machines are dependable, rugged, and fit in two vertical spaces of a standard 19” rack. Video bandwidth of  
200MHz ensures that the CVG-606xl and CVG-808xl remain transparent even in the most critical applications  
5.2 Features of the CVG-606xl and CVG-808xl Matrix Switchers  
Front/Rear panel features of the CVG-606xl are shown in Figure 1. The features are described in Table 1 and  
Table 2.  
NOTE  
For operation instructions refer to section 9.  
5
 
Figure 1: CVG-606xl Front/Rear Panel Features  
Table 1: CVG-606xl Front Panel Features  
Function  
No.  
Feature  
Power Switch  
1.  
2.  
Illuminated switch: supplies power to the unit.  
Select the desired output that the input signal is switched to.  
OUTPUT SELECTOR  
buttons  
3.  
INPUT SELECTOR  
Select the desired input to be switched to the output.  
buttons  
NOTE  
Pressing input buttons "1", "2" and "3"  
together resets the machine and performs a  
7-segment display test.  
4.  
5.  
6.  
Identifies a crosspoint between each output and the input below it.  
OUTPUT STATUS  
labels  
Displays the selected input switched to the output (marked above each input).  
INPUT STATUS  
display  
RCL illuminated button Should be pressed, followed by an input or output pushbutton to select a  
predetermined setup (1-6 available setups for the CVG-606xl and 1-8 setups for  
the CVG-808xl. For example, press RCL followed by INPUT 4 button to recall  
Setup # 4 from the non-volatile memory.  
6
 
No.  
Feature  
Function  
7.  
STO illuminated button Should be pressed, followed by an input or output pushbutton to store the current  
status in the non-volatile memory. For example. Press STO followed by INPUT  
4 button to store Setup # 4 in the non-volatile memory.  
NOTE  
To delete a setup from the memory, press the  
STO and RCL buttons simultaneously, followed  
by the input button (Setup number) to be  
deleted.  
8.  
9.  
AFV illuminated button When pressed, illuminates and selects the "Audio Follow Video" function. If the  
audio configuration differs from the video configuration, the INPUT STATUS  
display flashes the audio outputs that are to be reconfigured for AFV operation. In  
such case, the TAKE button must be pressed to confirm the modification.  
AUDIO  
When pressed, illuminates and selects the audio mode (Breakaway) to enable  
modification of the audio crosspoints.  
10. VIDEO  
11. TAKE  
When pressed, illuminates and selects the video mode (Breakaway) to enable  
modification of the video crosspoints.  
The machines can operate either in "Take" mode or in "Normal" (no user  
confirmation for each action is needed) mode. Pressing the TAKE button toggles  
the mode, and the button illuminates when in "Take Mode". In "Take Mode", any  
action would cause the TAKE button to blink before implementation, and the user  
is required to press TAKE again in order to implement the operation.  
NOTE  
To cancel any operation initiated by pressing a  
button, press the same button again.  
12. OFF  
13. ALL  
When pressed after pushing an output button, disconnects that video/audio output  
from the video/audio input. To disconnect all the outputs, press the ALL button  
followed by the OFF button.  
When pressed followed by an input button, connects that audio/video input to all  
audio/video outputs.  
Table 2: CVG-606xl Rear Panel Features  
No.  
Feature  
Function  
1.  
2.  
3.  
Audio inputs used to connect the stereo audio input sources.  
1-6 AUDIO INPUTS  
RCA connectors  
Audio outputs used to connect the stereo audio output acceptors.  
1-6 AUDIO OUTPUTS  
RCA connectors  
RS-485 terminal block  
Used for bi-directional communication with another Matrix Switcher or PC  
through RS-485 interface (see section 9.4 for more details concerning the RS-  
485 operation).  
4.  
5.  
EXT. SYNC BNC  
connector  
Used for connection of an external video sync input. The external sync input  
can be selected by the SYNC Select switch.  
SYNC Select switch  
Selects either an external sync from the external source, or internal sync, which  
is normally inputted via the VIDEO INPUT #1 connector (see section 9.3.1 for  
more information concerning the sync selection).  
6. VIDEO INPUTS BNC  
Video inputs used to connect the video sources.  
connectors  
7. VIDEO OUTPUTS BNC Video outputs used to connect the video acceptors.  
connectors  
8.  
DB-9 female RS-232  
connector  
Used for control of the Matrix Switcher (see section 9.4 for more details  
concerning the RS-232 operation) from a PC, or remote control device, through  
an RS-232 interface and a null-modem adapter (provided with the machine).  
NOTE  
7
 
No.  
Feature  
Function  
Operation of the machine from a remote PC  
may be done using the control software  
(provided with the machine).  
9.  
Setup DIP switches  
Allow proper configuration of the control signals received and transmitted  
through the RS-232 (or RS-485) control port, master/slave modifications, line  
termination and device ID numbers.  
10. Power Connector  
A 3-prong AC connector allows power to be supplied to the unit. Directly  
underneath this connector, a fuse holder houses the appropriate fuse.  
6
INSTALLATION  
6.1 Rack Mounting  
Each of the Matrix Switchers described in this manual may be rackmounted in a standard 19” (1U) EIA rack  
assembly and includes rack “ears” at the ends of the front panel. These devices do not require spacing above or  
below the unit for ventilation. To rack mount any of the Matrix Switchers, simply place the unit’s rack ears  
against the rack rails of the rack, and insert standard screws through each of the four corner holes in the rack  
ears.  
7
CONNECTING TO VIDEO DEVICES  
Video sources and output devices (such as monitors, or recorders) may be connected to the Matrix Switchers  
through the BNC type connectors located on the back of the unit. Bear in mind that the output signal format will  
match that of the input signal format.  
All signal connections that use more than one cable interconnecting between devices should be of equal length.  
(Example: cables between a camera and the machine should be equal in length).  
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9
CONNECTING TO AUDIO DEVICES  
Audio sources and output devices (such as amplifiers or recorders) may be connected to the machines through  
the RCA type connectors (CVG-808XL, CVG-606XL).  
USING THE MACHINES  
9.1 Powering on the Machine  
NOTES  
1. The machine should only be powered on, after all connections  
are completed, and all source devices have been powered on.  
Do not attempt to connect or disconnect any video, audio or  
control signals to the machine while it is powered on!  
2. The socket-outlet should be near the equipment and should be  
easily accessible. To fully disconnect equipment, remove  
power cord from socket.  
1. Press the toggle switch on the far left-hand side of the front panel to the ON position. The toggle switch  
glows.  
2. Operate the acceptors.  
9.2 Using the Front Panel Controls  
The front panels of CVG Matrix Switcher are designed to be simple to operate, and accomplish the basic  
function of selecting an input source and output device.  
9.2.1 Selecting an Output  
Output selection on the Matrix Switchers is made by pressing any of the buttons marked “1” through “8” (CVG-  
808XL), or "1" to "6" (CVG-606XL) on the front panel. These buttons correspond to output connections as  
marked on the back panel.  
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9.2.2 Selecting an Input  
Input selection on the Matrix Switchers is made by pressing any of the buttons marked “1” through “8” (CVG-  
808XL), or "1" to "6" (CVG-606XL) on the front panel. These buttons correspond to input connections as  
marked on the back panel.  
9.2.3 Connecting a Video/Audio Input/Output  
To connect a video/audio Input to a specific output, press the desired output button (upper line), followed by the  
desired input button (lower row).  
9.2.4 Disconnecting a Video/Audio Input  
To disconnect a video/audio Input from a specific output, press the desired output button followed by the OFF  
button. To disconnect all the outputs, press the ALL button, followed by the OFF button.  
9.2.5 Connecting a Video/Audio Input to All Outputs  
To connect a video/audio Input to all outputs, press the ALL button followed by the INPUT button  
corresponding to the input, which is to be routed to all the outputs.  
9.2.6 Selecting Video/Audio Control (Breakaway)  
For audio control only, press the AUDIO button. For video control only, press the VIDEO button. Note that the  
STATUS window displays audio or video settings in accordance with the selection.  
9.2.7 Using the Audio Follow Video Mode  
To select "Audio Follow Video" mode, press the AFV button. Note that if the audio configuration differs from  
the video configuration, the differing audio outputs blink in the STATUS window of the audio display. The  
AUDIO and TAKE buttons blink as well, which means that the audio configuration will be modified for AFV  
operation. Press the TAKE button to confirm the modification.  
9.2.8 Storing a Configuration  
To store a configuration, press the STO button, followed by input or an output button to mark the setup number.  
For example, press STO followed by INPUT # 3 button to store the current configuration in Setup # 3 in the  
internal non-volatile memory of the switcher. To abort an operation of the STO button once it was pressed,  
press it again.  
9.2.9 Recalling a Configuration  
To recall a configuration, press the RCL button, followed by an input or an output button, marking the setup  
number. For example, press RCL followed by INPUT# 3 button to recall Setup # 3 from the internal non-  
volatile memory of the switcher. To abort an operation of the RCL button once it was pressed, press it again.  
9.2.10 Deleting a Setup  
To delete a setup, press both the STO and the RCL buttons followed by the input button corresponding to the  
setup number, which is to be deleted.  
9.2.11 Using the Take Function  
To activate the "Take" Function, press the TAKE button (the TAKE button illuminates). After each pressing of  
the above-mentioned buttons, the TAKE button blinks together with the relevant numbers in the STATUS  
display. Confirmation of the action is implemented by pressing the TAKE button again (the TAKE button then  
stops blinking). If the STATUS display keeps on blinking for one minute (no button is pressed), the function  
will be aborted. To abort implementing an operation in “Take” mode, press that button which originally caused  
the display to blink.  
9.2.12 Resetting the Machine  
To reset the machine, press INPUTS buttons "1", "2" and "3" simultaneously. The machine resets itself and a 7-  
segment self-test is automatically performed.  
9.3 Using the Back Panel Controls  
The switcher ID numbers, the RS-232 / RS-485 settings, and the sync source selection are all configured on the  
back panel of the machine.  
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9.3.1 Selecting the Sync Source  
Input sync selection is made using the "Sync Select” button located on the back panel. For an external sync  
operation, press the “Sync Select” button. For an internal sync operation, release the “Sync Select” button. This  
modifies the input circuitry to select the required input sync source.  
9.3.2 Setting the Configuration Switches  
Setting the configuration switches is accomplished through a bank of DIP switches located on the back panel of  
each Matrix Switcher. Table 3 describes the settings and configurations for each of the DIP switches. To set the  
configuration switches, confirm that power to the Matrix Switcher is OFF, and with a small flathead  
screwdriver, move the DIP switches to the "ON" or "OFF" position as shown in Table 3 and Figure 3.  
Master/Slave DIP switches configure the Matrix Switcher for operation in a multiple switcher configuration. If a  
Matrix Switcher is operating and being controlled independently, it should be assumed that it is operating in the  
“Master” configuration.  
Up to 8 Matrix Switchers may be cascaded for control via a single port by configuring one Matrix Switcher as a  
"master", or ID number "1", while all the others are assigned as slave Matrix Switchers or an ID other than "1".  
When RS-232 connection is implemented, DIP switch # 8 allows you to enable RS-232 communication  
between the Matrix Switcher and the PC. This is desirable, so that the controlling device “knows” that the  
controlled device has carried out its instructions. When RS-485 connection is used for communication between  
the Matrix Switcher and the PC, DIP switch # 8 should be up ("OFF"). In some applications, it may be  
desirable for some machines not to reply to instructions received on the RS-232 and RS-485 ports. In this  
scenario, you would disable the “Reply”, or acknowledgement commands. DIP switch # 5 enables or disables  
"reply" from the Matrix Switcher to the PC.  
In the case of interconnection between more than two RS-485 receivers-transmitters (including PC), the  
termination resistor must be disconnected on all the devices, except the first and last machines on the  
communication line. DIP switch # 4 connects or disconnects the termination resistor.  
Table 3: DIP Switches Configuration  
"ON"= Connects the termination resistor.  
MACHINE  
NUMBER  
SELF ADDRESS  
DIP SWITCH  
DIP switch #4  
DIP switch #5  
"OFF"=  
Disconnects the termination  
resistor.  
"ON"= Enables reply from switcher to PC.  
2
1
0
3
2
1
"OFF"= Disables reply from switcher to  
PC.  
0
0
0
0
0
1
ON  
ON  
ON  
ON  
ON  
1. (Master)  
2.  
DIP switch #6,  
DIP switch #7  
DIP switch #8  
Not used  
OFF  
"ON"= Enables RS-232 communication  
between switcher and PC.  
"OFF"= Enables RS-485 communication  
between switcher and PC.  
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
ON  
ON  
OFF  
OFF  
ON  
ON  
OFF  
ON  
3.  
4.  
5.  
6.  
7.  
8.  
OFF  
OFF  
OFF  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
OFF  
Figure 2: DIP switches General View  
9.4 RS-232 and RS-485 Operation  
Connections made between your switcher and a PC are accomplished using your computer’s RS-232  
communication port, or by connecting the PC to the RS-485 terminal block connector. Bear in mind that serial  
10  
 
communication between Matrix Switchers is always via RS-485 (see example in Figure 5). The RS-232 port is  
either a DB-9 (9-pin port) or DB-25 (25-pin port). The cable connecting your switcher to the PC should be  
wired as shown in Figure 4. A 9-25 pin adapter or 9-9 pin null-modem adapter is included for your convenience.  
The null-modem adaptor is wired as shown in Figure 4. If using the adaptor (recommended), plug it into the  
PC’s serial port, and connect via a flat-cable from the other end of the adaptor to your switcher. Please keep in  
mind that it is not recommended to extend an RS-232 signal beyond a length of 30 feet, without the use of an  
RS-232 to RS-422 converter at both the PC and the switcher.  
If five machines and a PC are cascaded together for example, using RS-485 interconnection, disconnect the  
termination resistors on all machines except the fifth (see Figure 6). For similar setup, without a PC connected  
on the RS-485 line, disconnect all resistors except for the first and fifth machines.  
Figure 3: RS-232 Control Connector Wiring  
Figure 4: RS-232 and RS-485 Operation  
Figure 5: Terminating the Line  
11  
 
10 TYPICAL APPLICATIONS  
10.1 Basic Video-Audio Setup  
One of the most common video formats is composite video. Figure 7 describes a typical composite video setup  
using the CVG-808XL in this case. Three video-audio sources, three video-audio acceptors, and a genlock  
source are connected to the machine, while control of the Matrix Switcher is implemented via the PC using RS-  
232 communication.  
Perform the following steps (as necessary):  
1. Connect all video-audio sources to the video-audio inputs of the Matrix Switcher.  
2. Connect all video-audio acceptors to the video-audio outputs of the Matrix Switcher.  
3. Operate the Matrix Switcher, PC sources and acceptors.  
4. Select the required video input to be switched, using front panel input selector pushbuttons (or the software  
program controls).  
Figure 6: Basic Video-Audio Setup  
10.2 Component Switching using Multiple Matrix Switchers  
A commonly used video format is component video, and switching the three signals (components)  
simultaneously is sometimes a complicated task. Using several Matrix Switchers, however, this can be done  
very easily and efficiently. This is done by dedicating each switcher to a single component.  
For example, for an 8 input, 8 output RGBS matrix switcher, 4 CVG-808xl’s would be used – one for the Red  
component, one for Green, one for Blue, and one for Sync. Each component of the RGBS signal is then  
connected to the same input (or output) number on the switcher. For example, the first RGBS source is  
connected to Input #1 on the 4 switchers, the second is connected to Input #2 on the switchers, etc. The  
switchers are configured to mirror each other, so the input to output connections are identical on all 4 machines!  
In order to switch during the vertical interval when working in this way, the switchers should be configured for  
operation using the “Ext. Sync”. A sync source should then be connected to all the machines (for RGB this  
could be the Green channel, and for YUV this could be the Y channel).  
12  
 
The examples below detail the building of RGB matrices. The same principles may be used for YC (2  
switchers), YUV (3 switchers), RGBS (4 switchers), and RGBHV (5 switchers).  
10.2.1 RGB/YUV Switching with RS-232 (e.g. PC Control)  
For RS-232 control of the component matrix switcher, an additional piece of equipment would be required.  
Since RS-232 can only be used for control between 2 pieces of equipment (e.g. a PC and a switcher), we need a  
method of “distributing” the RS-232 to all 3 machines. The CVG-14 “RS-232 Port Extender” is designed for  
this purpose.  
Perform the following steps (as necessary):  
1. Connect the RGB sources to the VIDEO INPUTS connectors of the Matrix Switchers, connecting the “R”  
components to Matrix Switcher #1, “G” to #2, and B” to #3. Make sure that each component of a video  
source is connected to the same input number on the three switchers.  
2. Similarly, connect the RGB acceptors to the VIDEO OUTPUTS connectors of Matrix Switchers #1 to #3.  
3. If the video sources are synchronized, and vertical interval switching is desired, connect sync sources to all  
3 machines, and select to work with “Ext. Sync” (selector switch pressed in).  
4. Assign all 3 machines as machine number #1 (see Table 3: “DIP Switches Configuration" for more  
information).  
5. Set DIP switch #5 (Reply) of the first machine to "ON". Set to "OFF" for the other machines.  
6. Set DIP switch #8 of all the machines to "ON" (RS-232 communication between switchers and external  
controller).  
7. Connect the serial port of the PC to a port on the CVG-14, and connect each switcher to a CVG-14 port.  
Configure the DIP-switches of the CVG-14 for the 4 ports which were connected.  
8. Operate the Matrix Switchers, PC, CVG-14, RGB sources and RGB acceptors  
9. The inputs can now be switched to the outputs. This is done via the front panel switches of the first  
switcher, and/or via the PC.  
10.2.2 RGB/YUV Switching with RS-485 Control (or no External Control)  
Communication between the switchers is implemented via RS-485, which could also be extended to an external  
controller.  
Perform the following steps (as necessary):  
1. Repeat steps 1-3 of section 10.2.1.  
2. Connect the RS-485 terminal block connectors of all the Matrix Switchers in parallel using RS-485 cable,  
and connect to also an external controller if required.  
3. Assign all the machines with the same machine number - but NOT machine #1 - using the DIP switches  
located at the back of the machine, (as described in Table 3: “DIP Switches Configuration").  
4. NOTE: The machines are all assigned as slaves having the same machine number. A master machine is  
not assigned.  
5. Set DIP switch #4 (RS-485 termination) of the third machine to "ON" and of the second machine to  
"OFF". If an RS-485 external controller is connected, then DIP switch #4 of the first machine should be set  
to "OFF"; if no external controller is used, set this switch to "ON".  
6. Set DIP switch #5 (Reply) of the first machine to "ON". Set to "OFF" for the other machines.  
7. Operate the Matrix Switchers, controller (if used), RGB sources and RGB acceptors.  
8. The inputs can now be switched to the outputs. This is done via the front panel switches of the first  
switcher, and/or via the external controller.  
11  
TAKING CARE OF YOUR MATRIX SWITCHER  
Do not locate your Matrix Switcher in an environment where it is susceptible to dust or moisture. Both of these  
may damage the electronics, and cause erratic operation or failure. Do not locate your Matrix Switcher where  
temperature and humidity may be excessive. Doing so may also damage the electronics, and cause erratic  
operation or failure of your Matrix Switcher. Do not clean your Matrix Switcher with abrasives or strong  
cleaners. Doing so may remove or damage the finish, or may allow moisture to build up. Take care not to allow  
dust or particles to build up inside unused or open connectors.  
13  
 
12  
TROUBLESHOOTING  
NOTES  
1. Please note that if the output signal is disturbed or  
interrupted by very strong external electromagnetic  
interference, it should return and stabilize when such  
interference ends. If not, turn the power switch off and on  
again to reset the machine.  
2. If the recommended actions still do not result in satisfactory  
operation, please consult your CVG Dealer.  
12.1 Power and Indicators  
Problem  
Remedy  
No power  
1. Confirm that the rocker switch is in the “ON” position, and that the lamp is  
illuminated.  
2. Confirm that power connections are secured at the machine and at the  
receptacle. Make sure the receptacle is active, outputting the proper mains  
voltage.  
3. If there is still no power, check the fuse. Remove power cord from the AC  
outlet and from the machine and then, using a flat screwdriver, remove the  
fuse holder located directly below the power connector. Confirm that the fuse  
is good by looking at the wire connected to the ends of the fuse. If the wire is  
broken, replace the fuse.  
12.2 Video Signal  
Problem  
Remedy  
No video at the output  
device, regardless of input  
selected.  
1. Confirm that your sources and output device are powered on and connected  
properly. Video signals connected to the input of your machine should be of an  
identical signal format at the output of your source. Video signals at the output  
of your machine should be of an identical signal format as at the input of your  
display or recorder.  
2. Confirm that any other switchers in the signal path have the proper input  
and/or output selected.  
3. Use the Video Tester to test the video path leading to/from your Matrix  
Switcher (see section 4.1 " Video Tester")  
Video level is too high or  
too dim.  
1. Verify that the video line is well matched through 75ohm impedance,  
otherwise it results in a video level that is too high or too dim when looping is  
performed and the termination switches are not in proper position.  
2. Confirm that the connecting cables are of high quality, properly built and  
terminated with 75ohm BNC connectors. Check level controls located on your  
source input device or output display or recorder.  
14  
 
Problem  
Remedy  
Hum bars (ground loop) are caused by a difference in the ground potential  
Noise bars are "rolling" up  
or down in the output  
image  
of any two or more devices connected to your signal path. This difference  
is compensated by passing that voltage difference through any available  
interconnection, including your video cables.  
or:  
Low Frequency Hum in  
the audio output  
WARNING!  
Do not disconnect the ground from any piece of  
video equipment in your signal path!  
Check the following to remove hum bars:  
1. Confirm that all interconnected equipment is connected to the same phase of  
power, if possible.  
2. Remove equipment connected to that phase that may introduce noise, such as  
motors, generators, etc.  
3. Disconnect all interconnect cables and reconnect them one at a time until the  
ground loop reappears. Disconnect the affected cable and replace, or insert an  
isolation transformer in the signal path.  
12.3 Audio Signal  
Problem  
Remedy  
No audio at the output  
device, regardless of input  
selected  
1. Confirm that your sources and output device are powered on and connected  
properly. Audio signals connected to the input of your machine should be  
properly wired to the output of your source. Audio signals connected to the  
output of your machine should be properly wired to the input of your machine  
or recorder.  
2. Confirm that any other amplifiers in the signal path have the proper input  
and/or output selected. Pay special attention to input amplifiers that may be  
built into your acceptor.  
Audio level is too low  
1. Confirm that the connecting cables are of high quality and properly built. Take  
special care in noting the wiring configuration of balanced to unbalanced  
cables.  
2. Check level controls located on your source input device or output display or  
recorder.  
12.4 Control  
Problem  
Remedy  
No control of Matrix  
Switcher from PC  
software  
1. Confirm the wiring of the connecting cable. This pin configuration may be found in  
Figure 4. Cable length should not exceed 25 feet.  
2. Confirm that all DIP switches on the Matrix Switcher have been set properly. Keep  
in mind that if you are only controlling one Matrix Switcher on a specific port, that  
Matrix Switcher must be assigned the ID of “1”.  
3. Confirm that the baud rate of your computer COM port is set to the same as that of  
your Matrix Switcher (9600-Baud). Confirm that the proper COM port is selected in  
the control software.  
4. Confirm that bi-directional communication is enabled on all Matrix Switchers.  
Please refer to Section 9.3.2 "Setting the Configuration Switches" for proper  
configuration for your Matrix Switcher.  
5. With custom software, do not send multiple commands at the same time. The Matrix  
Switcher must complete one command and send the reply, before receiving another.  
6. Confirm that the computer you are using supports true RS-232C protocol.  
Computers such as the Apple Macintosh do not!  
15  
 
12.5 Switching Malfunctions  
Problem  
Remedy  
Malfunction in the particular source or cable assembly.  
The switcher succeeds  
in switching a number  
of sources then fails to  
switch one.  
NOTE  
The most common failure mode in transferring the signal of  
an audio source is a break in the connecting wire.  
Disconnect the source from a channel that is switching successfully and connect the  
suspect source to it. If the channel continues to switch successfully, then there is  
something wrong with the Matrix Switcher or the suspect source was not connected  
properly. If it does not continue to switch successfully, then there is something wrong  
with the source or cable assembly. Check them.  
The Matrix Switcher  
turns ON but will not  
switch at all  
One of the two flat cables leading from the main board to the control board may be  
disconnected and the switch command is not being transferred to the Matrix  
Switcher. Check them.  
13  
COMMUNICATION PROTOCOL  
Communication with the Matrix Switchers described in this manual uses four bytes of information as defined  
below. Data is transferred at 9600 baud with no parity, 8 data bits and 1 stop bit.  
1st byte  
DESTINATION  
INSTRUCTION  
0
7
D
6
N5  
5
N4  
4
N3  
N2  
2
N1  
1
N0  
0
3
MSB  
LSB  
2nd byte  
INPUT  
1
0
6
0
5
0
4
I3  
3
7
3rd byte  
OUTPUT  
1
7
0
6
0
5
0
4
O3  
3
4th byte  
MACHINE NUMBER  
1
7
0
6
0
5
0
4
0
3
M2  
2
M1  
1
1st BYTE: Bit 7 – Defined as "0",  
D – “DESTINATION BIT”  
This bit is always "low", when sending from the PC to the Matrix Switchers, and "high" for information sent to  
the PC.  
N5…N0 – “INSTRUCTION”.  
The function that is to be performed by the Matrix Switcher (s) is defined by these 6 bits. Similarly, if a function  
is performed via the machine’s keyboard, then these bits are set with the INSTRUCTION NO. which was  
performed. The instruction codes are defined according to the table below (INSTRUCTION NO. is the value to  
be set for N5…N0).  
2nd BYTE:  
Bit 7 – Defined as "1".  
Bits 4 – 6 - Defined as "0".  
I3… I0 – “INPUT”.  
When switching via RS-232 for RS- 485 (for instruction codes 1 and 2), these bits set the input that is to be  
switched. Similarly, if switching is done via the machine’s keyboard, then these bits are set with the input  
16  
 
number which was switched. For disconnect, set as 0. For other operations, these bits are defined according to  
the table.  
3rd BYTE:  
Bit 7 - Defined as "1".  
Bits 4-6 Defined as "0".  
O3 – O0 – “OUTPUT”.  
When switching via RS-232 or RS-485 (for instruction codes 1 and 2), the output to switch is set by these bits.  
Similarly, if switching is done via the machine’s keyboard, then these bits are set with the output number which  
was switched. For other operations, these bits are defined according to the table.  
4th BYTE:  
Bit 7 – Defined as "1".  
Bits 3-6 Defined as "0".  
M2… M0 – “Machine Number”.  
Machine Number = (DIP – Switch Code) + 1.  
INSTRUCTION  
DESCRIPTION  
DEFINITION FOR SPECIFIC INSTRUCTION  
INPUT OUTPUT  
NOTE  
#
0
1
RESET MACHINE  
SWITCH VIDEO  
0
0
1
2
Set equal to video input to be  
switched  
Set equal to video output to be  
switched (0=to all the outputs)  
2
3
SWITCH AUDIO  
STORE STATUS  
Set equal to audio input to be  
switched  
Set equal to audio output to be  
switched (0=to all the outputs)  
2
Set as SETUP #(1-8) or (1-6 for - To store parameters  
the CVG-606XL)  
2,7  
- to delete setup  
4
5
6
7
RECALL STATUS  
Set as SETUP #(1-8) or (1-6 for Don’t care  
the CVG-606XL)  
2,7  
3,7  
3,7  
2
REQUEST STATUS OF A  
VIDEO OUTPUT  
Set as SETUP #(1-8) or (1-6 for Equal to output number whose  
the CVG-606XL)  
status is read  
REQUEST STATUS OF AN Set as SETUP #(1-8) or (1-6 for Equal to output number whose  
AUDIO OUTPUT  
the CVG-606XL)  
status is read  
VIS SETTING  
Don’t care  
- for immediate switching  
- for VIS switching  
- for audio-follow-video  
- for breakaway  
8
BREAKAWAY SETTING  
Don’t care  
2
9
NOT USED  
10  
REQUEST VIS SETTING  
Set as SETUP #(1-8) or (1-6 for Don’t care  
the CVG-606XL)  
3,7  
3,7  
11  
REQUEST BREAKAWAY Set as SETUP #(1-8) or (1-6 for Don’t care  
SETTING  
the CVG-606XL)  
12 to 14 NOT USED  
15  
REQUEST WHETHER  
SETUP IS DEFINED  
Set as SETUP #(1-8) or (1-6 for Don’t care  
the CVG-606XL)  
4
16  
17  
18  
19  
ERROR/BUSY  
Don’t care  
Don’t care  
5
6
RESERVED  
RESET MACHINE  
STORE STATUS  
0
0
1
Set as SETUP #(1-8) or (1-6 for 0-to store parameters  
the CVG-606XL)  
2,7,9  
1-to delete setup  
20  
RECALL STATUS  
Set as SETUP #(1-8) or (1-6 for Don’t care  
the CVG-606XL)  
2,7,10  
8,2  
21 to 56 NOT USED  
57  
SET AUTO-SAVE  
for auto save  
0 – no save  
Don’t care  
Don’t care  
58 to 60 RESERVED  
61  
IDENTIFY MACHINE  
1or 2 – machine name  
3 or 4 – version  
11  
17  
 
NOTES ON THE ABOVE TABLE:  
NOTE 1 - When the master switcher is reset, (e.g. when it is turned on), the reset code is sent to the PC. If this code is sent  
to the switchers, it will reset according to the present power down settings.  
NOTE 2 - These are bi-directional definitions. That is, if the switcher receives the code, it performs the instruction, and if  
the instruction is performed (due to a keystroke on the front panel), then these codes are sent. For example:  
0000 0001  
1000 0101  
1000 1000  
0011  
was sent from the PC, then the switcher (machine # 3) will switch input 5 to output 8. If the user switched input # 1 to output  
# 7 via the front panel keypad, then the switcher will send:  
0100 0001  
1000 0001  
1000 0111  
1000 0011  
to the PC.  
When the PC sends one of the commands in this group to the switcher, then, if the instruction is valid, the switcher replies by  
sending to the PC the same four bytes that it sent (except for the first byte, where the DESTINATION bit is set "high").  
NOTE 3 - The reply to a "REQUEST" instruction is as follows: the same instruction and INPUT codes as were sent are  
returned, and the OUTPUT is assigned the value of the requested parameter. The replies to instructions 10 and 11 are as per  
the definitions in instructions 7 and 8 respectively. For example, if the present status of machine number # 5 is breakaway  
setting, then the reply to  
0000 1011  
1000 0001  
1000 0000  
1000 0101  
0100 1100  
1000 0001  
1000 0001  
1000 0101  
Would be ⇒  
NOTE 4-The reply to the "REQUEST WHETHER SETUP IS DEFINED" is as in TYPE 3 above, except that here the  
OUTPUT is assigned with the value 0 if the setup is not defined; or 1 if it is defined.  
NOTE 5-An error code is returned to the PC if an invalid code was sent to the switcher (e.g. trying to save to a setup greater  
than 8, or trying to switch an input or output greater than the highest one defined). This code is also returned to the PC if an  
RS-232 instruction is sent while the machine is being programmed via the front panel. Reception of this code by the switcher  
is not valid.  
NOTE 6–This code is reserved for internal use.  
NOTE 7-SETUP #0 is the present setting. SETUP #1 to SETUP# 8 are the settings saved in the switcher's memory, (i.e.  
those used for Store and Recall).  
NOTE 8-Under normal conditions, the machine's present status is saved each time a change is made. The "power-down"  
save (auto-save) may be disabled using this code. Note that whenever the machine is turned on, auto-save function is set.  
NOTE 9–This is identical to instruction 3 (machine uses instruction 3, when sending to PC).  
NOTE 10–This is identical to instruction 4 (machine uses instruction 4, when sending to PC).  
NOTE 11-This is a request to identify the switcher/s in the system. If the INPUT is set as 1 or 2, the machine will send its  
name. The reply is the decimal value of the INPUT and OUTPUT. For example, the reply to the request to send machine  
name (for machine number 001) would be:  
0111 1101  
1000 1000 (i.e. 128 + 8)  
1000 1000 (i.e. 128 + 8)  
1000 0001  
If the request for identification is sent with the INPUT set as 3 or 4, the appropriate machine will send its software version  
number. Again, the reply would be the decimal value of the INPUT and OUTPUT - the INPUT representing the number in  
front of the decimal point, and the OUTPUT representing the number after it.  
For example, for version 3.5, the reply would be:  
0111 1101  
1000 0011 (i.e. 128 + 3)  
1000 0101 (i.e. 128 + 5)  
1000 0001  
18  
 
TABLE OF HEX CODES FOR THE MASTER CVG-808xl  
The table below shows the “HEX” codes for switching the master CVG-808xl.  
The table is also valid for the CVG-606xl if the last two rows and columns are ignored.  
OUT 1 OUT 2 OUT 3 OUT 4 OUT 5 OUT 6 OUT 7 OUT 8  
01  
81  
81  
81  
01  
82  
81  
81  
01  
83  
81  
81  
01  
84  
81  
81  
01  
85  
81  
81  
01  
86  
81  
81  
01  
87  
81  
81  
01  
88  
81  
81  
01  
81  
82  
81  
01  
82  
82  
81  
01  
83  
82  
81  
01  
84  
82  
81  
01  
85  
82  
81  
01  
86  
82  
81  
01  
87  
82  
81  
01  
88  
82  
81  
01  
81  
83  
81  
01  
82  
83  
81  
01  
83  
83  
81  
01  
84  
83  
81  
01  
85  
83  
81  
01  
86  
83  
81  
01  
87  
83  
81  
01  
88  
83  
81  
01  
81  
84  
81  
01  
82  
84  
81  
01  
83  
84  
81  
01  
84  
84  
81  
01  
85  
84  
81  
01  
86  
84  
81  
01  
87  
84  
81  
01  
88  
84  
81  
01  
81  
85  
81  
01  
82  
85  
81  
01  
83  
85  
81  
01  
84  
85  
81  
01  
85  
85  
81  
01  
86  
85  
81  
01  
87  
85  
81  
01  
88  
85  
81  
01  
81  
86  
81  
01  
82  
86  
81  
01  
83  
86  
81  
01  
84  
86  
81  
01  
85  
86  
81  
01  
86  
86  
81  
01  
87  
86  
81  
01  
88  
86  
81  
01  
81  
87  
81  
01  
82  
87  
81  
01  
83  
87  
81  
01  
84  
87  
81  
01  
85  
87  
81  
01  
86  
87  
81  
01  
87  
87  
81  
01  
88  
87  
81  
01  
81  
88  
81  
01  
82  
88  
81  
01  
83  
88  
81  
01  
84  
88  
81  
01  
85  
88  
81  
01  
86  
88  
81  
01  
87  
88  
81  
01  
88  
88  
81  
IN 1  
IN 2  
IN 3  
IN 4  
IN 5  
IN 6  
IN 7  
IN 8  
For Technical Support, contact us at:  
Comprehensive Video Group  
55 Ruta Court  
South Hackensack, NJ 07606  
800-526-0242  
19  
 

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